Parse tests as private functions.

They actually are private; we can't export / import tests. Fixes #284.

examples/acceptance_tests/047/aiken.lock

@@ -0,0 +1,5 @@
+# This file was generated by Aiken
+# You typically do not need to edit this file
+
+requirements = []
+packages = []

examples/acceptance_tests/047/aiken.toml

@@ -0,0 +1,3 @@
+name = 'aiken-lang/acceptance_test_047'
+version = '0.0.0'
+description = ''

examples/acceptance_tests/047/assets/foo/spend/mainnet.addr

@@ -0,0 +1 @@
+addr1w9z47fyj9ffqck2fnld04k27zfe04wq6n9zj76u4ghu4xdcd0futm

examples/acceptance_tests/047/assets/foo/spend/payment_script.json

@@ -0,0 +1,5 @@
+{
+  "type": "PlutusScriptV2",
+  "description": "Generated by Aiken",
+  "cborHex": "4e4d01000022253335734944526161"
+}

examples/acceptance_tests/047/assets/foo/spend/script.cbor

@@ -0,0 +1 @@
+4d01000022253335734944526161

examples/acceptance_tests/047/assets/foo/spend/testnet.addr

@@ -0,0 +1 @@
+addr_test1wpz47fyj9ffqck2fnld04k27zfe04wq6n9zj76u4ghu4xdck8aqy7

examples/acceptance_tests/047/validators/foo.ak

@@ -0,0 +1,7 @@
+fn spend(_datum: Void, _redeemer: Void, _ctx: Void) -> Bool {
+  True
+}
+
+test foo() {
+  1 + 1 == 2
+}